Hand-hole plate.



W. G. MORRISON.

} HAND HOLE PLATE.

APPLICATION FILED AUG. 5, 1910.- I

1,025,71 O. Patented May 7, 1912.

WITNESSES INVEITOR W6. Menu-0n UNITED STATES PATENT OFFICE.

WILLIAM G. MORRISON, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR OF ONE-HALF'I'O WILLIAM RICHARD$ON, OF ST. LOUIS, MISSOURI.

HAND-HOLE PLATE.

1,025,710, Specification of Letters Patent.

Application filed August 5, 1910.

Patented May '7, 1912.

Serial No. 575,643.

To all whom it may concern In the construction shown in Figs. 1, 2, Beit known that I, WILLIAM C. Mountand 3, the circular seat 8, and therings 9 N, a citizen of the U it d Stat s of and 10, are of suchrespective width and A i idi t Pitt b h, th thickness, that the rings donot occupy all county 0f Allegheny and State of Pennsyl- Of the spaceafforded by the seat, the diamvania, have invented certain new anduseful B 1" f the disk or plate at the point where Improvements inHand-Hole Plates, of which the following is a specification, referencebeing had therein to the accompanying drawing.

This invention relates to certain new and useful improvements inhand-hole plates, and relates more specifically to means for securinghand-hole plates in position in boilers.

The object of the invention is to provide a simple, cheap and effectivehand-hole plate provided with means for securing same in positionwithout the aid of nuts, screws or like objectionable devices nowgenerally employed.

With the above and other objects in view which will appear as theinvention is hereinafter more specifically described and thenspecifically claimed, the invention consists in the novel construction,combination, and arrangement of parts as set forth and shown in theaccompanying drawing showing preferable embodiments of the invention,and to which reference will be had in the further description, likenumerals being employed to designate like parts throughout the differentviews, in which Figure 1, is a sectional view showing one of my improvedhand-hole plates secured in position in a boiler, Fig. 2, is a view infront elevation thereof, Fig. 3, is a plan view of the hand-hole plateshowing the boiler head in section, and Fig. 4:, is a sectional viewshowing a modified form of construction.

In the drawings, 5 indicates a portion of a boiler plate, provided witha hand-hole 6 for well known purposes.

The hand-hole plate designated by the numeral 7, is in substantially theform of a disk which is reduced in diameter for substantially one halfof its thickness, forming a circular seat 8 and an annular shoulder 9.On thiscircular ring or asket 10, which engages the seat is formed beingsubstantially the same as the diameter of the hand-hole 6, so that themetallic ring or gasket 11 will engage with the inner face of the boilerplate 5, and, when the plate 7 is tightened, a portion of the circularseat will be drawn into the hand-hole as the resilient ring or gasket 10compresses. The disk 7, on its outer face is provided with acentrally-disposed stem 12, through which is a slot 1%, located close tothe base of the stem and which receives a securing wedge or key 15.Obviously,when the plate is in position, and the wedge or key isinserted in the slot in the stem and then tightened, the plate will besecurely held in place, and a tight joint also effected between theplate 7 and the boiler plate 5, the resilient gasket compressing as thekey or wedge is tightened.

In the construction shown in Fig. 4, in so far as the plate per 86 andthe means of securing same in position is concerned, the same isidentical with that above described. In this view however, I show theemployment of a single gasket or packing ring 16 which packing may be ofany desired or preferred form. Upon loosening the key, the hand-holeplate may be forced inwardly after the key has been removed to giveaccess to the boiler head.

Having fully described my invention, what I claim is 1-- The combinationwith a boiler having a hand-hole, of a hand-hole cover comprising amember having its body-portion substantially solid and of a peripheralconfiguration approximating that of the hand-hole, said body-portionhaving its rear or inner portion formed with a peripheral flangeprojecting outwardly, the inner faces of the flange and body-portionhaving substantially co-incident planes, the distance between theforward faces of the flange and body-portion being greater than thethickness of the boiler plate, said body-portion also having an integralforwardly-projecting fastening member slotted diametrically seat 8, ismounted a resilient 5 against the annular shoulder 9 of the plate, andis held thereon by a metallic ring or gasket 11.

intermediate its ends, yieldable Ineans car- In testimony whereof Iafiix my signaried by the body-portion in advance of the ture in thepresence of two witnesses. flange for decreasing the distance between tT the flange and body-portion faces and act- VILLIAM MORRIbUIi' 5 ing asa packing for the cover, and a key Vitnesses:

insertible in the slot of the fastening inem- KARL H. BUTLER, her forsecuring the cover in position. Eva A. MILNE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). C.

